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	author          = {E. Onur and C. Ersoy and H. Delic and L. Akarun},
	title           = {Surveillance with wireless sensor networks in obstruction: Breach
	paths as watershed contours},
	journal         = {Computer Networks},
	year            = {2010},
	month           = {February},
	volume          = {54},
	number          = {3},
	pages           = {428--441},
	issn            = {1389-1286},
	abstract        = {For surveillance applications of wireless sensor networks, analysis
	of sensing coverage and quality of sensing is crucial. For rough
	terrains where obstacles block the sensing capability, region-based
	approaches must be employed to determine the sensing quality. In
	this paper, we present a method to determine the breach paths and
	the deployment quality defined as the minimum of the maximum detection
	probabilities on the breach paths in the presence of obstacles. We
	propose the utilization of watershed segmentation on the iso-sensing
	map that reveals the equally-sensed regions of the field-of-interest
	in a surveillance application. Probabilistic sensor models are utilized
	to produce the iso-sensing map considering the sensing coverage degree
	and reliability level as the design criteria. The watershed segmentation
	algorithm is applied on the iso-sensing map to identify the possible
	breach paths. An algorithm is proposed to convert the watershed segmentation
	to an auxiliary graph which is then employed to determine the deployment
	quality measure (DQM). The effects of the sensor count and coverage
	degree on the DQM are analyzed.}